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Mean absolute and relative changes in ventricular CSF volume between baseline and after surgical closure of the dural breach in patients with spontaneous intracranial hypotension for each ventricle separately: lateral ventricles (left, mean relative change, +18.7%, P = .001), third ventricle (mean relative change, +25.5%, P = .001), and fourth ventricle (mean relative change, +20.9%, P = .008).
